package String;

public class StringStringBuilder {
    public static void main(String[] args) {
//        String s1 = "a";
        StringBuilder s = new StringBuilder("a");
        for (int i = 0;i<100;i++){
            s.append(i);
        }
        System.out.println(s);
        System.out.println("执行完毕");
    }
}
